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/* $OpenBSD: tls13_record.c,v 1.8 2021/05/16 14:19:04 jsing Exp $ */
/*
* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "tls13_internal.h"
#include "tls13_record.h"
struct tls13_record {
uint16_t version;
uint8_t content_type;
size_t rec_len;
uint8_t *data;
size_t data_len;
CBS cbs;
struct tls13_buffer *buf;
};
struct tls13_record *
tls13_record_new(void)
{
struct tls13_record *rec = NULL;
if ((rec = calloc(1, sizeof(struct tls13_record))) == NULL)
goto err;
if ((rec->buf = tls13_buffer_new(TLS13_RECORD_MAX_LEN)) == NULL)
goto err;
return rec;
err:
tls13_record_free(rec);
return NULL;
}
void
tls13_record_free(struct tls13_record *rec)
{
if (rec == NULL)
return;
tls13_buffer_free(rec->buf);
freezero(rec->data, rec->data_len);
freezero(rec, sizeof(struct tls13_record));
}
uint16_t
tls13_record_version(struct tls13_record *rec)
{
return rec->version;
}
uint8_t
tls13_record_content_type(struct tls13_record *rec)
{
return rec->content_type;
}
int
tls13_record_header(struct tls13_record *rec, CBS *cbs)
{
if (rec->data_len < TLS13_RECORD_HEADER_LEN)
return 0;
CBS_init(cbs, rec->data, TLS13_RECORD_HEADER_LEN);
return 1;
}
int
tls13_record_content(struct tls13_record *rec, CBS *cbs)
{
CBS content;
tls13_record_data(rec, &content);
if (!CBS_skip(&content, TLS13_RECORD_HEADER_LEN))
return 0;
CBS_dup(&content, cbs);
return 1;
}
void
tls13_record_data(struct tls13_record *rec, CBS *cbs)
{
CBS_init(cbs, rec->data, rec->data_len);
}
int
tls13_record_set_data(struct tls13_record *rec, uint8_t *data, size_t data_len)
{
if (data_len > TLS13_RECORD_MAX_LEN)
return 0;
freezero(rec->data, rec->data_len);
rec->data = data;
rec->data_len = data_len;
CBS_init(&rec->cbs, rec->data, rec->data_len);
return 1;
}
ssize_t
tls13_record_recv(struct tls13_record *rec, tls13_read_cb wire_read,
void *wire_arg)
{
uint16_t rec_len, rec_version;
uint8_t content_type;
ssize_t ret;
CBS cbs;
if (rec->data != NULL)
return TLS13_IO_FAILURE;
if (rec->content_type == 0) {
if ((ret = tls13_buffer_extend(rec->buf,
TLS13_RECORD_HEADER_LEN, wire_read, wire_arg)) <= 0)
return ret;
tls13_buffer_cbs(rec->buf, &cbs);
if (!CBS_get_u8(&cbs, &content_type))
return TLS13_IO_FAILURE;
if (!CBS_get_u16(&cbs, &rec_version))
return TLS13_IO_FAILURE;
if (!CBS_get_u16(&cbs, &rec_len))
return TLS13_IO_FAILURE;
if ((rec_version >> 8) != SSL3_VERSION_MAJOR)
return TLS13_IO_RECORD_VERSION;
if (rec_len > TLS13_RECORD_MAX_CIPHERTEXT_LEN)
return TLS13_IO_RECORD_OVERFLOW;
rec->content_type = content_type;
rec->version = rec_version;
rec->rec_len = rec_len;
}
if ((ret = tls13_buffer_extend(rec->buf,
TLS13_RECORD_HEADER_LEN + rec->rec_len, wire_read, wire_arg)) <= 0)
return ret;
if (!tls13_buffer_finish(rec->buf, &rec->data, &rec->data_len))
return TLS13_IO_FAILURE;
return rec->data_len;
}
ssize_t
tls13_record_send(struct tls13_record *rec, tls13_write_cb wire_write,
void *wire_arg)
{
ssize_t ret;
if (rec->data == NULL)
return TLS13_IO_FAILURE;
while (CBS_len(&rec->cbs) > 0) {
if ((ret = wire_write(CBS_data(&rec->cbs),
CBS_len(&rec->cbs), wire_arg)) <= 0)
return ret;
if (!CBS_skip(&rec->cbs, ret))
return TLS13_IO_FAILURE;
}
return rec->data_len;
}
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